爛泥：centos安裝LVM方式

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本文首發於爛泥行天下。

最近開始打算學習有關LVM邏輯卷的知識，由於以前沒有接觸過，看了很多有關這方面的視頻。但是一直不深入。今天就先不管了，先把centos系統安裝在LVM上。

有關LVM在這做個簡單的介紹，LVM是邏輯卷管理器，在LVm中有三個比較重要的概念PV、VG、LV。

其中PV表示物理卷是整個LVM的最底層

VG表示卷組，卷組是建立一個或多個PV上。

LV表示邏輯卷，邏輯卷是建議在卷組上的，一個卷組上可以建立一個或多個LV。

好了，把centos安裝在LVM上目前我們知道這麼多就夠了。

現在我們開始進行centos的安裝，本次實驗還是在KVM虛擬機器上進行。

登入KVM伺服器，建立centos安裝所需要的硬碟，使用如下命令：

qemu-img create -f qcow2 /vhostdisk/testlvmos.img 10G

650) this.width=650;" title="clip_image001" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image001" src="http://img1.51cto.com/attachment/201408/13/526870_1407918529D8vC.png" width="787" height="102" />

硬碟建立完畢後，我們開始安裝centos，使用如下名：

virt-install -n testlvmos -r 2048 --vcpus=2 --os-type=linux --accelerate -c /iso/CentOS-6.5-x86_64-minimal.iso --disk path=/vhostdisk/testlvmos.img,format=qcow2,bus=ide --network bridge=br0 --vnc --vncport=5994 --vnclisten=0.0.0.0 --force --autostart

650) this.width=650;" title="clip_image002" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image002" src="http://img1.51cto.com/attachment/201408/13/526870_1407918531mSRZ.png" width="1200" height="149" />

使用VNC用戶端串連KVM虛擬機器，然後開始安裝centos，如下：

650) this.width=650;" title="clip_image003" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image003" src="http://img1.51cto.com/attachment/201408/13/526870_14079185362DKH.png" width="660" height="547" />

650) this.width=650;" title="clip_image004" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image004" src="http://img1.51cto.com/attachment/201408/13/526870_1407918537freC.png" width="740" height="467" />

650) this.width=650;" title="clip_image005" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image005" src="http://img1.51cto.com/attachment/201408/13/526870_1407918542BxCn.png" width="1044" height="835" />650) this.width=650;" title="clip_image006" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image006" src="http://img1.51cto.com/attachment/201408/13/526870_14079185445dK4.png" width="1044" height="835" />

650) this.width=650;" title="clip_image007" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image007" src="http://img1.51cto.com/attachment/201408/13/526870_1407918545TXpf.png" width="1044" height="835" />

650) this.width=650;" title="clip_image008" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image008" src="http://img1.51cto.com/attachment/201408/13/526870_1407918547I6xR.png" width="1044" height="835" />

650) this.width=650;" title="clip_image009" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image009" src="http://img1.51cto.com/attachment/201408/13/526870_1407918549YJWe.png" width="1044" height="835" />

650) this.width=650;" title="clip_image010" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image010" src="http://img1.51cto.com/attachment/201408/13/526870_1407918551Ks0j.png" width="1044" height="835" />

650) this.width=650;" title="clip_image011" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image011" src="http://img1.51cto.com/attachment/201408/13/526870_1407918554xx1W.png" width="1044" height="835" />

650) this.width=650;" title="clip_image012" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image012" src="http://img1.51cto.com/attachment/201408/13/526870_1407918555PYSd.png" width="1044" height="835" />

以上的操作在此，就不多做介紹。下面我們今天的主角，在分區中我們選擇自訂分區，如下：

650) this.width=650;" title="clip_image013" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image013" src="http://img1.51cto.com/attachment/201408/13/526870_1407918559RUhc.png" width="1044" height="835" />

650) this.width=650;" title="clip_image014" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image014" src="http://img1.51cto.com/attachment/201408/13/526870_1407918561IVzJ.png" width="1044" height="835" />

通過，我們看到目前該硬碟總共10G，我現在的資料分割配置是/boot分區，單獨分區並且給與500M空間，不在LVM中。其他的分區全部在LVM中。

現在開始首先把/boot分出來。如下

650) this.width=650;" title="clip_image015" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image015" src="http://img1.51cto.com/attachment/201408/13/526870_1407918563YjkA.png" width="770" height="625" />

650) this.width=650;" title="clip_image016" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image016" src="http://img1.51cto.com/attachment/201408/13/526870_14079185642JdY.png" width="520" height="480" />

現在/boot分區已經分出來，還剩餘900M左右的空閑空間，如下：

650) this.width=650;" title="clip_image017" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image017" src="http://img1.51cto.com/attachment/201408/13/526870_1407918566TS37.png" width="666" height="266" />

下面我們把sda硬碟剩餘的空間sda2，全部建立為PV物理卷，如下：

650) this.width=650;" title="clip_image018" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image018" src="http://img1.51cto.com/attachment/201408/13/526870_1407918568JS23.png" width="707" height="489" />

650) this.width=650;" title="clip_image019" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image019" src="http://img1.51cto.com/attachment/201408/13/526870_1407918569GBQC.png" width="519" height="485" />

物理卷建立完畢後，硬碟目前的分區情況如下：

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現在我們開始建立卷組VG1，如下：

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同時把物理卷sda2，全部加入卷組VG1中，如下：

650) this.width=650;" title="clip_image022" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image022" src="http://img1.51cto.com/attachment/201408/13/526870_1407918574nWRS.png" width="565" height="493" />

卷組建立後，目前硬碟的分區情況如下：

650) this.width=650;" title="clip_image023" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image023" src="http://img1.51cto.com/attachment/201408/13/526870_1407918576bEK8.png" width="593" height="237" />

現在我們開始建立LV邏輯卷，如下：

650) this.width=650;" title="clip_image024" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image024" src="http://img1.51cto.com/attachment/201408/13/526870_14079185784P8g.png" width="720" height="540" />

我們首先在LVM上建立swap分區給與2048M空間，並命名邏輯卷為LogVol00，如下：

650) this.width=650;" title="clip_image025" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image025" src="http://img1.51cto.com/attachment/201408/13/526870_1407918579dKT5.png" width="371" height="244" />

650) this.width=650;" title="clip_image026" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image026" src="http://img1.51cto.com/attachment/201408/13/526870_1407918581xgkR.png" width="586" height="317" />

然後以同樣的方法，建立根分區在LVM上給與5000M空間，並命名邏輯卷名稱為LogVol01，如下：

650) this.width=650;" title="clip_image027" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image027" src="http://img1.51cto.com/attachment/201408/13/526870_1407918582M0t4.png" width="620" height="251" />

以上分區完畢後，現在LVM還有2688M空間，我們暫時保留。繼續進行系統的安裝，如下：

650) this.width=650;" title="clip_image028" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image028" src="http://img1.51cto.com/attachment/201408/13/526870_1407918585xyge.png" width="1044" height="835" />650) this.width=650;" title="clip_image029" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image029" src="http://img1.51cto.com/attachment/201408/13/526870_1407918587X456.png" width="1044" height="835" />

650) this.width=650;" title="clip_image030" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image030" src="http://img1.51cto.com/attachment/201408/13/526870_1407918590B9Ck.png" width="1044" height="835" />系統安裝完畢後，重啟並登入系統，使用df命令進行查看，如下：

650) this.width=650;" title="clip_image031" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;margin:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image031" src="http://img1.51cto.com/attachment/201408/13/526870_1407918591pOgF.png" width="488" height="124" />

通過我們可以看到，根分區確實在LVM下。我們也可以使用lvs、lvdisplay命令查看邏輯卷的資訊，如下：

650) this.width=650;" title="clip_image032" style="border-right-width:0px;background-image:none;border-bottom-width:0px;padding-top:0px;padding-left:0px;padding-right:0px;border-top-width:0px;" border="0" alt="clip_image032" src="http://img1.51cto.com/attachment/201408/13/526870_14079185936KPO.png" width="562" height="557" />

本文出自 “爛泥行天下” 部落格，請務必保留此出處http://ilanni.blog.51cto.com/526870/1539535